'It's 100 percent about Harry': Taylor Swift's I Knew You Were Trouble 'written about cheating One Direction singer Styles'

Their on/off romance dominated tabloid headlines for the majority of last year until they finally called it quits.

But Taylor Swift has apparently immortalised her romance with Harry Styles in one of her infamous break-up anthems.

The 23-year-old country music darling reportedly penned I Knew You Were Trouble about the One Direction star's cheating ways.

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The ring master: Taylor Swift reportedly made a dig at ex-boyfriend Harry Styles during her Grammy performance in Los Angeles on February 10

The former couple reportedly called it quits for
good last October when a photo of him kissing a model in Australia
circulated around the internet.

They are believed to have started dating early
last year but split due to their busy schedules, reconciled late last
year but ended it for good following a row during a New Year's holiday
to the British Virgin Islands.

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A source toldRadarOnline: 'Taylor was
crushed over Harry the first time they dated, and like she always does,
she penned a song about him to deal with her broken heart.

'I Knew You Were Trouble is one
hundred percent about Harry. She knew he was young and popular with the
ladies and wasn’t ready for a serious relationship, but somehow hoped
she could make it work.'

Happier times: Taylor and One Direction star Harry Styles walk through New York City's Central Park on December 2, 2012

According to the insider, Taylor penned the track during one of the pair's break-ups.

'She was head over heels for Harry so
even though she knew he was bad news for her, she gave him another
chance,' the source said.

Taylor sings: 'Cause I knew you were
trouble when you walked in, So shame on me now; Flew me to places I’d
never been, So you put me down ,oh… When your saddest fear comes
creeping in, That you never loved me or her or anyone or anything.'

Rumours swirled the song was about Harry after Taylor released the music video for the track.

One scene shows the singer
accompanying her fictional boyfriend getting a tattoo - a poignant
moment as she went with Harry in real life on more than one occasion
while he got inked.

Look familiar: A scene in Taylor's music video for I Knew You Were Trouble shows the singer accompanying her movie boyfriend to get a tattoo - not long after she went on a similar trip with Harry

According to the outlet, Harry is
aware the song was penned with him in mind. But the 19-year-old singer
is reportedly thrilled to be back on the market and isn't giving Taylor a
second thought.

'Harry pretty much knows the song is about him but doesn’t really care. He’s just happy to be single again,' the source said.

Taylor has not yet confirmed who I Knew You Were Trouble is about.

But she defended her decision to make songs about her exes in an interview withElle magazine published earlier this month.

'To me it’s just writing songs the way I always have. It’s me sitting on my bed feeling pain I didn’t understand, writing a song, and understanding it better,' she said.

On the small screen: Actor Reeve Carney played Taylor's love interest in the music video

'If people want to dissect the lyrics, that’s their right, but it’s all coming from the exact same place as where I started.

'It’s just something I do to feel better.'

But in an apparent dig at her former British love, the singer adopted an English accent as she pretended to speak on her phone mid-performance during a rendition of We Are Never Ever Getting Back Together while performing at the Grammy Awards on February 10.

'I'm sorry, I'm busy opening the Grammys and we're never getting back together,' she quipped, seemingly mocking the One Direction star.

Harry meanwhile broke his silence on his short-lived romance with Taylor last week.

Speaking as he took to the decks at
jeweller Dominic Jones' London Fashion Week after-party at The Box in
London on Sunday night, the One Direction singer admitted Taylor is a
'sweet girl' and he has no qualms with potentially bumping into her at
Wednesday's BRIT Awards earlier in the month.

Speaking to Grazia magazine about his
former flame, he said: 'I'm not worried about seeing her at all. She's a
sweet girl, you know, I don't have a bad word to say about her.'